I have a 2005 Dodge Grand Caravan w/85,000 and the 3.3L engine that has been giving me quite a few troubles lately. First issue that came up was the check engine light came on, took it to the garage and they said it was from the upstream O2 sensor, they had to order me a new one. While we were waiting for it to come in the van starting running a little rough, seemed to have a slight flutter or skip to it when it needed more power, did it at all speeds reguardless of what gear it was in. Mech told me to change plugs and wires, which I did, and it didn't help. After this I had him check fuel pump pressure and he said it was within spec. O2 sensor came in and was changed...........now here is where the real fun starts. The check engine light never went off, but the code for the O2 sensor went away, but now the van is running really bad, no power and when you step on the gas to try to go up a hill it jerks and spits and sputters pretty badly, to the point where you can't even make it up a steep hill. Took it back to mech, now codes for MAP sensor and Cam postion sensor are showing up. He changes those, the van regains power, and stops cutting out when you step on it, allthough it still has that slight "skip" to it. But now also the check engine light is still one, and it's the SAME O2 sensor. Well we take it to another garage and they pretty much go through the same routine......check fuel pump pressure........still withinn spec, and order us another O2 sensor. They have not changed that O2 sensor yet, and today the spitting, jerking, loss of power, engine problems returned. This time it happened when I was going down the interstate at 70 MPH w cruise on, the cruise cut out and would not come back on when the problems returned. If I shut the van off and turned it right back on, the cruise would work, and the van would run better for 5 or so miles then the cruise would quit, and the rough running would start allover again............I have no idea what codes are showing up now, and won't till monday, but I am thinking this is beyond an O2 sensor problem. BTW engine runs fine, no knocking or pinging, no burning oil, or fuel or water in the oil, it's not using water, or running hot, tranny is not slipping or out of oil. I am thinking I have an fuel injection problem or a engine computer problem..............but i am sick of hearing "well we have to change the O2 sensor and see what happens"

Sometimes when you get a lot of different codes popping up it's an indication of a different problem other than the exact sensor the code is indicating... It's just telling you there is a problem in that circuit. Personally it's been rare for me to find a car having 2 or more sensors fail at the same time. Usually it's electrical problem or bad PCM, with Chrysler, either is very possible..

I've seen a few of these Caravans with bad injector harnesses. You can wiggle the harness & see if that has any effect on how it runs, if it has any effect good or bad more than likely there is a problem inside......

You'll see the harness, it comes out from under the plenum and the connector is by the p/s pump reservoir. If you're feeling energetic, you could open the loom & inspect the wires, they corroded inside close the the connector..........

There's multiple codes both of those sensors could set so without the exact code number it doesn't help much.....

But even with the code number the next thing you would do is hook up the equipment you have and 1st check power source and ground of the sensor and then the signal wire to see if the signature or frequency (which ever method you perfer) is with in specs..